—Can I go to the park, Mum? —Certainly.
题型:选择题
问题:
—Can I go to the park, Mum?
—Certainly. But you ______ be back by six o'clock. [ ]
A. can
B. may
C. might
D. must
—Can I go to the park, Mum?
—Certainly. But you ______ be back by six o'clock. [ ]
A. can
B. may
C. might
D. must